Preparation method of wear-resistant and abrasion-resistant WC-CoCr coating

A corrosion-resistant and coating technology, which is applied in the field of preparation of wear-resistant and corrosion-resistant WC-CoCr coatings, can solve the problems of limited wear-resistant and corrosion-resistant properties and uneven dispersion of coatings, and achieve improved wear-resistant and corrosion-resistant properties, Reduced wear rate, effect of high corrosion potential

Active Publication Date: 2017-03-29
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems of uneven dispersion of Co and Cr in the preparation process of the existing WC-Co-Cr coating, and limited wear and corrosion resistance of the coating, starting from improving the physical and chemical properties of the metal binder phase, and adopting the Method to prepare WC-CoCr coating with high wear resistance and high corrosion resistance

Method used

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  • Preparation method of wear-resistant and abrasion-resistant WC-CoCr coating
  • Preparation method of wear-resistant and abrasion-resistant WC-CoCr coating
  • Preparation method of wear-resistant and abrasion-resistant WC-CoCr coating

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Embodiment 1

[0018] Mix cobalt ingots and chromium ingots in proportion, put argon as a protective gas in an induction suspension melting furnace for melting and mixing, in which the mass fraction of cobalt is 33%, and the power of the melting furnace is first increased to 3kW, kept for 1min, and then every 10s , the power of the smelting furnace was increased by 2kW until it reached 17kW, and the power was adjusted to zero after 5 minutes of heat preservation. After the sample was naturally cooled, an ingot of cobalt-chromium intermetallic compound was obtained. The cobalt-chromium intermetallic compound ingot was ball-milled and crushed, the ball-milling medium was absolute ethanol, the ball-to-material ratio was 3:1, and the ball-milling time was 15 h, the flaky CoCr intermetallic compound powder with an average thickness of about 0.8 μm was obtained (its apparent Micromorphology such as figure 1 a). The WC powder with an average particle size of 480nm and the CoCr intermetallic compou...

Embodiment 2

[0020] Mix cobalt ingots and chromium ingots in proportion, put argon as a protective gas in an induction suspension melting furnace for melting and mixing, in which the mass fraction of cobalt is 40%, first increase the power of the melting furnace to 4kW, keep it warm for 1min, and then , the power of the smelting furnace was increased by 2kW until it reached 18kW, and the power was adjusted to zero after 4 minutes of heat preservation. After the sample was naturally cooled, an ingot of cobalt-chromium intermetallic compound was obtained. The cobalt-chromium cast intermetallic compound ingot was ball-milled and crushed, the ball-milling medium was absolute ethanol, the ball-to-material ratio was 4:1, and the ball-milling time was 40 h, the flake CoCr intermetallic compound powder with an average thickness of about 0.6 μm was obtained (its apparent Micromorphology such as figure 1 b). The WC powder with an average particle size of 230nm and the CoCr intermetallic compound po...

Embodiment 3

[0022] Mix cobalt ingots and chromium ingots in proportion, put argon as a protective gas in an induction suspension melting furnace for melting and mixing, in which the mass fraction of cobalt is 46%, first increase the power of the melting furnace to 5kW, keep it warm for 1min, and then , the power of the smelting furnace was increased by 2kW until it reached 19kW, and the power was adjusted to zero after 3 minutes of heat preservation. After the sample was naturally cooled, an ingot of cobalt-chromium intermetallic compound was obtained. The cobalt-chromium intermetallic compound ingot was ball-milled and crushed, the ball-milling medium was absolute ethanol, the ball-to-material ratio was 5:1, and the ball-milling time was 60 h, the flake CoCr intermetallic compound powder with an average thickness of about 0.2 μm was obtained (its apparent Micromorphology such as figure 1c). The WC powder with an average particle size of 90nm and the CoCr intermetallic compound powder we...

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Abstract

The invention discloses a preparation method of a wear-resistant and abrasion-resistant WC-CoCr coating and belongs to the technical field of preparation of metal ceramic coatings. The preparation method comprises the following steps that cobalt ingots and chrome ingots are mixed in proportion and put in an induction suspended smelting furnace to be fused and mixed with argon as protective gas, so that a cobalt-chrome intermetallic compound cast ingot is obtained; the cobalt-chrome intermetallic compound cast ingot is broken through ball grinding, and CoCr intermetallic compound sheets with the average thickness being 0.2-0.8 microns are obtained; WC powder with the average grain size being smaller than 500 nm and the CoCr intermetallic compound sheets are mixed through wet grinding and sufficiently dried, and then WC-CoCr powder is obtained; and with the WC-CoCr powder as a raw material, thermal spraying feed powder is obtained through aggregation granulation and airflow grading treatment, and the powder is sprayed with a supersonic speed flame spraying process. The WC-CoCr coating with high wear resistance and corrosion resistance can be obtained by adoption of the method.

Description

technical field [0001] The invention belongs to the technical field of preparation of cermet coatings, in particular to a preparation method of wear-resistant and corrosion-resistant WC-CoCr coatings. Background technique [0002] Thermal sprayed WC-Co coatings are widely used in the surface protection of metal materials due to their good wear resistance and corrosion resistance. Among them, WC as a hard phase mainly plays an anti-wear role, and metal Co as a bonding phase is conducive to the preparation of WC-based composite materials while improving its plasticity and toughness, while the addition of Cr element can form a stable oxide film to make the coating obtain a certain degree of wear resistance. corrosion resistance. From the perspective of composition, a key prerequisite for the preparation of WC-Co-Cr coatings with high wear resistance and corrosion resistance is to obtain WC-Co-Cr raw material powders with uniform dispersion of each phase. The existing WC-Co-Cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C22C29/08
CPCC22C29/067C22C29/08C23C4/06
Inventor 王海滨宋晓艳占王彬王学政刘雪梅
Owner BEIJING UNIV OF TECH
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